Chiesa di Santa Maria del Giglio
You can show your digital tickets at any one of the 16 Churches of the Circuit (except FRARI) in exchange for your Chorus pass, which grants you one admission to each of the 16 churches.
A good one to start at is the Chiesa di Santa Maria del Giglio, which features the work of Giuseppe Sardi on its facade, and Peter Paul Rubens' "Virgin Mary and Child with Saint Giovannino" on the inside.
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If you are interested in seeing the many churches of Venice, this ticket may be what you need. Just keep in mind that you won't be able to see everything in one day. Furthermore, many of the churches may not be worth stopping at. Do your research and set a course through the ones that shouldn't be missed.